Pinpoint Test P: All The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

P1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH
- Ignition OFF.
- Disconnect: Stoplamp Switch C2064 .
- Measure the voltage between the stoplamp switch C2064-1 , circuit SBB59 (BU/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between Stoplamp Switch C2064-1, Circuit SBB59 (BU/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts?
- Yes : GO to P2 .
- No : VERIFY the BJB fuse 59 (10A) is OK. If OK, REPAIR circuit SBB59 (BU/RD) for an open. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
P2 BYPASS THE STOPLAMP SWITCH
- Connect a fused jumper wire between the stoplamp switch C2064-1 , circuit SBB59 (BU/RD), harness side and the stoplamp switch C2064-4 , circuit CCB08 (VT/WH), harness side.
  
  Fig 2: Connecting Fused Jumper Wire Between Stoplamp Switch C2064-1, Circuit SBB59 (BU/RD) And Stoplamp Switch C278-4, Circuit CCB08 (VT/WH), Harness Side
  Courtesy of FORD MOTOR CO.
Do the stoplamps illuminate?
- Yes : REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
- No : LEAVE the jumper wire connected. GO to P3 .
P3 CHECK THE STOPLAMP SWITCH SIGNAL TO THE BCM
- Disconnect: BCM C2280B .
- Measure the voltage between the BCM C2280B-28 , circuit CCB08 (VT/WH), harness side and ground.
  
  Fig 3: Measuring Voltage Between BCM C2280B-28, Circuit CCB08 (VT/WH), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts?
- Yes : REMOVE the jumper wire.
  For Edge, VERIFY the BCM fuse 15 (15A) is OK. If OK, GO to P4 . If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
  
  For MKX, GO to P5.
- No : REMOVE the jumper wire. REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
P4 BYPASS THE BCM
NOTE: If the jumper wire fails, refer to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. After the repair: If no DTCs are present, test the system for normal operation.

If DTC U1000:00 is present, clear the DTCs and repeat the self-test (required to enable the stoplamp output driver if DTC U1000:00 is present) . Test the system for normal operation.

If DTC U3000:49 is present, install a new BCM . Refer to MULTIFUNCTION ELECTRONIC MODULES . Test the system for normal operation.
- Disconnect: BCM C2280D .
- Connect a fused jumper wire between the BCM C2280D-14 , circuit CLS52 (BN), harness side and battery positive terminal.
  
  Fig 4: Connecting Fused Jumper Wire Between BCM C2280D-14, Circuit CLS52 (BN) And Battery Positive Terminal
  Courtesy of FORD MOTOR CO.
Do the stoplamps illuminate?
- Yes : REMOVE the jumper wire. GO to P5 .
- No : REMOVE the jumper wire. REPAIR circuit CLS52 (BN) for an open. TEST the system for normal operation.
P5 CHECK FOR CORRECT BCM OPERATION
- Disconnect all the BCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.